Modern development of elements of theory, technology and mini-mills of radial-shear rolling

Abstract

Formulas for calculating the trajectory deformation coefficients during radial-shear rolling are presented in an analytical form, which make it possible to estimate the gradient of the deformation-kinematic state of the metal under conditions of helicoidal flow. The layer-by-layer nature of the change in the metal flow rate, coefficients, intensity, and deformation schemes has been established. An expression for evaluating the rotational deformation is obtained. The basic schemes for setting up symmetrical three-roll calibers used in the RSR minimills are presented. The technical characteristics of the modern line of RSR minimills designed by MISIS are presented. The basic arrangement of mills 30-70 and 90-220 is described, which significantly expands the dimensional range of rolling diameters on RSR minimills. Effective technological solutions based on RSR, implemented in practice, are discussed. In particular, in the field of creating low-cost technologies for recycling and secondary use of lengthy machine-building parts taken out of service. On the example of minimill 90-220 of a special design, the possibility of using RSR for preliminary deformation of continuously cast billets under the conditions of an operating industrial PRP-160 with a three-roll rolling mill is shown.